Method and apparatus to produce a smooth input speed profile in mode for a hybrid powertrain system

• US 8,290,681 B2
• Filed: 10/13/2008
• Issued: 10/16/2012
• Est. Priority Date: 10/29/2007
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG, Daimler AG (Mercedes-Benz Group AG), Chrysler Group LLC (Stellantis NV)
• Original Assignee: Bayerische Motoren Werke AG, GM Global Technology Operations LLC (General Motors Company), Daimler AG (Mercedes-Benz Group AG), Chrysler Group LLC (Stellantis NV)
• Inventors: Kaminsky, Lawrence A., Heap, Anthony H., Sah, Jy-Jen F.
• Primary Examiner(s): Elchanti, Hussein
• Assistant Examiner(s): Khatib, Rami
• Application Number:
  US12/250,327
• Publication Number:
  US 20090112417A1
• Time in Patent Office: 1,464 Days
• Field of Search: 701/22, 701/51, 701 54- 60, 701 67- 70, 701 93- 95, 701 98- 99, 701101-115, 903902-947, 180 651- 6531
• US Class Current: 701/99
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• CPC Class Codes: B60K 2006/4833 Step up or reduction gearing driving generator, e.g. to operate generator in most efficient speed range
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/30 Control strategies involving selection of transmission gear ratio control of change speed gearings, together with other vehicle sub-units B60W10/10; HEV transmission gearing B60K6/36; gearings and control thereof F16H
• CPC Class Codes: B60W 2050/0012 Feedforward or open loop systems
• CPC Class Codes: B60W 2050/0022 Gains, weighting coefficients or weighting functions
• CPC Class Codes: B60W 2050/0052 Filtering, filters
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/081 Speed
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 2710/0605 : Throttle position
• CPC Class Codes: B60W 2710/0644 : Engine speed
• CPC Class Codes: B60W 2710/083 : Torque
• CPC Class Codes: B60W 50/0097 : Predicting future conditions
• CPC Class Codes: F16H 2037/0866 : Power split variators with distributing differentials, with the output of the CVT connected or connectable to the output shaft
• CPC Class Codes: F16H 2037/102 : the input or output shaft of the transmission is connected or connectable to two or more differentials
• CPC Class Codes: F16H 2037/104 : Power split variators with one end of the CVT connected or connectable to two or more differentials
• CPC Class Codes: F16H 2037/106 : with switching means to provide two variator modes or ranges
• CPC Class Codes: F16H 2200/201 : with three sets of orbital gears
• CPC Class Codes: F16H 2200/2041 : with four engaging means
• CPC Class Codes: F16H 3/728 : with means to change ratio in the mechanical gearing
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility

Abstract

A method for controlling a powertrain including an electro-mechanical transmission coupled to an engine and an electric machine includes monitoring a desired input speed; signal processing the desired input speed to create a lead control signal to control the engine, wherein the signal processing includes low pass filtering the desired input speed and applying system constraint limits upon the desired input speed; signal processing the desired input speed to create an immediate control signal to control the electric machine, wherein the signal processing includes delaying the desired input speed by a lead period, low pass filtering the desired input speed, and applying system constraint limits upon the desired input speed; and controlling the powertrain through a powertrain transition based upon the lead control signal and said immediate control signal.

Claims

1. Method for controlling a powertrain comprising an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine, said method comprising:

monitoring a desired input speed of an input shaft of the transmission;

signal processing said desired input speed to create a lead control signal to control said engine, wherein said signal processing comprises

low pass filtering said desired input speed, and

applying system constraint limits upon said desired input speed;

signal processing said desired input speed to create an immediate control signal to control said electric machine, wherein said signal processing comprises

delaying said desired input speed by a lead period,

low pass filtering said desired input speed, and

applying system constraint limits upon said desired input speed; and

controlling said powertrain through a powertrain transition based upon said lead control signal and said immediate control signal;

wherein the engine and the electric machine simultaneously transmit torque independently to the transmission through separate inputs; and

wherein a speed of the engine and a speed of the electric machine change independently.

2. The method of claim 1,

wherein said transmission is further coupled to a second electric machine, and

wherein said signal processing creating said immediate control signal further creates a second immediate control signal to control said second electric machine.

3. The method of claim 1, further comprising applying a moving average filter to said desired input speed prior to said signal processing.

4. The method of claim 3, further comprising:

monitoring a desired input acceleration; and

utilizing said desired input acceleration as a feed forward modifier of said desired input speed in combination with said moving average filter.

5. The method of claim 1,

wherein said lead control signal comprises an input acceleration lead immediate profile, and

wherein said method further comprises applying a low pass filter and a filter constraint to said input acceleration lead immediate profile to generate an input acceleration lead predicted profile describing a predicted operation of said powertrain after said powertrain transition.

6. The method of claim 5,

wherein said input acceleration lead immediate profile is used to control a spark timing of said engine, and

wherein said input acceleration lead predicted profile is used to control a throttle setting of said engine.

7. The method of claim 1,

wherein said immediate control signal comprises an input acceleration immediate profile, and

wherein said method further comprises integrating said input acceleration immediate profile to generate an input speed immediate profile useful to implement a feedback control of an input speed.

8. The method of 7, further comprising applying a moving average filter and a delay to said input speed immediate profile generating a smoothed-delayed input speed immediate profile useful to provide feedback control to said input speed at a same sample rate as an input speed feedback controller and synchronized with electric machine output.

9. Method for controlling a powertrain comprising an electro-mechanical transmission mechanically-operatively coupled to an internal combustion engine and an electric machine, said method comprising:

monitoring a desired input speed of an input shaft of the transmission generated at a sample rate lower than a sample rate used in commands to said engine and lower than a sample rate used in commands to said electric machine;

generating a desired lead filtered input speed with a sample rate higher than said desired input speed by applying a moving average filter to said desired input speed;

signal processing said desired lead filtered input speed to create a lead control signal to control said engine, wherein said signal processing comprises

low pass filtering said desired lead filtered input speed, and

applying system constraint limits upon said desired lead filtered input speed;

signal processing said desired lead filtered input speed to create an immediate control signal to control said electric machine, wherein said signal processing comprises delaying said desired lead filtered input speed by a lead period,

low pass filtering said desired lead filtered input speed, and

applying system constraint limits upon said desired lead filtered input speed; and

controlling said powertrain through a powertrain transition based upon said lead control signal and said immediate control signal;

wherein the engine and the electric machine simultaneously transmit torque independently to the transmission through separate inputs; and

wherein a speed of the engine and a speed of the electric machine change independently.

10. The method of claim 9, further comprising monitoring a desired input acceleration, wherein said generating said desired lead filtered input speed with a sample rate higher than said desired input speed further includes applying a feed-forward modifier based upon said desired input acceleration.